Improvement in processes of manufacturing anthracene



Patented Nov.7,1a7s;

' INVENTOR s; cABo'r, Jr.- PROCESS 0F MANUFACTURING ANV'HTHRACENE.

WITNESSES SAMUEL cABoT, JR., or BosToN, MASSACHUSETTS.

IWEPRVEMENTIN PROCESSES OF MANUFACTURING ANTHRACENE.

Specification forming part of Letters Patent No. 184,142, dated November 7, 1876; application filed October 31, 1876.

i To all whom it may concern Be it known that I, SAMUEL OABOT, Jr., ofV

Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in the Art of Manufacturing Anthracene or other heavy hydrocarbons from coal-tar or wood-tar; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it pertains to make. and use it, reference being had to theaccompanying drawings, which form part of this specification, and the following is a description of my improved process.

The tar having been heated up to the teniperature, or near to the temperature, at which the hydrocarbon desired distils, the vapor of some light liquid the latent heat of which is less than that of steam is forced into the heated tar by pumping a little with the forcepump B into the large hot pipes c c c, Src., which volatilize and superheat it, and then the heated vapor passes down the vertical pipe a to or nearly to the bottom of the still A. By this means the heavy vapor of the hying and condensing4 is a more difficult and troublesome process than with a light hydrocarbon. I prefer for this purpose one of the petroleum ethers on account of their cheapness, and from the fact that the light oil which condenses'is useful in the subsequent purification of the crude authracene7 enabling this to be performed with less benzinefor petro,

leum ether, as the distillate consists of such ether miXed with the authracene or heavy hydrocarbon. While I prefer for this purpose the petroleum ethers or the lighter oils of tar,

I do not restrict myself to these, but only tothe vapor of any liquid the latent heat of which is less than that of steam.

What 4I claim as my invention is 1. The process of manufacturing lauthracene or other heavy hydrocarbons, consisting, essentially, in injecting into the still a vapor having less latent heat than steam to raise authracene or heavy hydrocarbon out of the October, 1876.

Witnesses: SAMUEL OABOT, JR.

HENRY A. SEYMOUR, THOMAS B. HALL. 

